B&B Electronics HVD100A3 Benutzerhandbuch

12 

HDV100A3 Command & Response Manual-1306cr 

B&B Electronics -- 707 Dayton Rd. -- PO Box 1040 -- Ottawa, IL 61350 

PH (815) 433-5100 -- FAX (815) 433-5104

 

 

 
Receiving Data from the J1708 Bus 
 
 

After the HDV100A3 is set into its Intelligent mode of operation 

and the RS-232 data rate is configured, you are now ready to communicate 
with the J1708 bus. A receive command must be sent to the HDV100A3 
before attempting to transmit to the bus. The receive message synchronizes 
the HDV100A3 with the bus. To start receiving J1708 bus data, send the 
following to the HDV100A3.  
 

1 

01 

Start of frame 

2 

02 

The number of control bytes 

3 

01 

ID byte 01= J1708  

4 

11 

Function code 11 hex start receive 

5 

00 

Number of data bytes (00 place holder) 

6 

15 

Checksum (bytes 1 through 5 added together) 

 

After sending this command to the device, the device will respond 

with a confirmation message. The message confirms that the command was 
received by the HDV100A3 and the checksum verified correctly. The reply 
from the device is formatted as follows: 
 

1 

01 

Start of frame byte 

2 01  Control 

byte 

3 

01 

ID byte (ID of the sent message) 

4 

00 

Number of data bytes 

5 03  Checksum 

 

 

The confirmation message is sent in response to a command sent to 

the device. The ID byte and the check-sum will change with different 
commands but the format will remain the same. If the checksum is not 
correct an error message is sent. Its format is covered at the end of this 
document. 
 

To stop receiving data from the J1708 bus send the following 

command to the HDV100A3.